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the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim

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Over here in the colonies, we don't know from Boiler Mates, and I'm sure you have already discovered the same documents I foumd. The word "fiddly" came up in the second link and while we don't use that term often on this side of the pond, it definitely sounds pejorative.

Unfortunately, as we say over here, you may be "in for it".

Other than a reset, have you tried a "hard" reset by pulling the power? How about control/alt/delete ???

odd noise like popping or singeing fire....clicking noises.....sounds like you have a water leak putting out the pilot.......or your thermo coupling is bad....or the noise is the tank full of calcium buildup and that will make noises when the burner is on

not an engineer but maybe a heating compant,, it sounds like you have a relay that has gone bad, you have what we call a winter summer system your domestic water comes from a tank inside the boiler, you might want to think about splitting the system to save you some money in the long run, seperate the water heater from the boiler so you only heat up in the winter, right now you are heating the system that heats your house to get 30 or 40 gals of domestic hot water, it would cost you less by seperating them

back boiler run from a gas fire? check the instructions to operate the gas heat to the back boiler not just the fireI presume that this a fully pumped system - air lock doubtful There maybe on/off valves on the pipes to and from the back boiler [situate close to cylinder] make sure they are on - anticlockwise turnor there could be a blockage in the outlet from header tank usually in the loft. or If there is no water in it maybe the mains cold feed it is off. Note if no water in it DO NOT USE the back boiler

if you have hot water at the taps but the heating isn't working make sure the thermostat is set high enough for the boiler to run check the time clock settings are on.
if these are working it could be a faulty diverter valve switch not sending a signal to the boiler to run.

Did you put automatic vent plugs on this boiler?This help stop from having air locks.I would try bleeding the high pipe to see if any air come out.The other thing I would check is the valve that out for the pump to pump water around.

hi this problem sounds like a pump problem. now if its not in the airing cupboard, sometimes they can be besides the boiler in a cupboard or under the floor where the boiler is sited, or boxed in in a dummy casing either side of the boiler/fire unit.
i suspectthatthe pump is stuck & needs releasing or worse case scenario a new unit fitted.
The reason you mentioned about frequently getting air in the system is condusive of sludge build up or the pipe-work configuration is not installed correctly giving rise to air being drawn into the system & posing future probs such as component failure.
If the pump is sited under the floor by the boiler it is at risk of collecting sludge as its at the lowest point in the system.

Recommendations re-site the pump if possible & look to have the system power flushed, to assist the life expectancy of the system